package org.apache.hadoop.examples;

import java.io.IOException;
import java.io.PrintStream;
import java.util.StringTokenizer;
import java.util.regex.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Mapper.Context;
import org.apache.hadoop.mapreduce.Reducer;
//import org.apache.hadoop.mapreduce.Reducer.Context;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

public class WordCount
{

   //deliveryid 
    public static IntWritable getDeliveryId(String line){
        Matcher matcher = Pattern.compile("delivery ([\\d]+):").matcher(line);
        if(matcher.find()){
            return new IntWritable(Integer.parseInt(matcher.group(1)));
        }else{
            return new IntWritable(0);
        }
    }

  public static class TokenizerMapper
    extends Mapper<Object, Text, Text, IntWritable>
  {
    private static final IntWritable one = new IntWritable(1);
    private Text word = new Text();
    
    public void map(Object key, Text value, Mapper<Object, Text, Text, IntWritable>.Context context)
      throws IOException, InterruptedException
    {
      /*StringTokenizer itr = new StringTokenizer(value.toString());
      while (itr.hasMoreTokens())
      {
        this.word.set(itr.nextToken());
        context.write(this.word, one);
      }
        */
        String line = value.toString();
        Matcher matcher = Pattern.compile("delivery ([\\d]+):").matcher(line);
	Matcher matcher2 = Pattern.compile("remote (\\w)+@([\\w\\.]+)").matcher(line);

	if(matcher.find() && matcher2.find()){
  	    this.word.set(matcher.group() + matcher2.group());
            context.write(this.word,one );
	}
    }
  }
  
  public static class IntSumReducer
    extends Reducer<Text, IntWritable, Text, IntWritable>
  {
    private IntWritable result = new IntWritable();
    
    public void reduce(Text key, Iterable<IntWritable> values, Reducer<Text, IntWritable, Text, IntWritable>.Context context)
      throws IOException, InterruptedException
    {
      int sum = 0;
      for (IntWritable val : values) {
        sum += val.get();
      }
      this.result.set(sum);
      context.write(key, this.result);
    }
  }
  
  public static void main(String[] args)
    throws Exception
  {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2)
    {
      System.err.println("Usage: wordcount <in> <out>");
      System.exit(2);
    }
    Job job = new Job(conf, "word count");
    job.setJarByClass(WordCount.class);
    job.setMapperClass(TokenizerMapper.class);
    job.setCombinerClass(IntSumReducer.class);
    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
  }
}


